Wireless Channel Feedback via Control Frame Data Fields
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in providing timely and accurate feedback on channel conditions, leading to suboptimal selection of transmit parameters and reduced system throughput due to infrequent updates and high overhead in link adaptation reports.
Innovation Solution
A method and apparatus for providing feedback on wireless communication channels by estimating channel conditions and generating a data field with communication parameters, which is attached to a control frame, allowing for more frequent and accurate selection of transmit parameters, such as modulation and coding schemes or spatial streams, through the use of reserved bits or capability indicators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If link adaptation reports are transmitted frequently to provide timely channel feedback, then the accuracy and timeliness of transmit parameter selection is improved, but the overhead and resource consumption increase
Solution Approach 1:
The patent extracts only the essential channel feedback information needed for transmit parameter selection and transmits it in a compact format within control frames, rather than sending complete link adaptation reports. This selective extraction reduces feedback overhead while maintaining the accuracy needed for effective link adaptation.
Solution Approach 2:
The patent combines channel feedback transmission with existing control frame exchanges (such as acknowledgment frames) already present in the wireless communication protocol. By merging feedback transmission with necessary control signaling, the system achieves timely feedback without adding separate dedicated feedback transmission overhead.
2Loss of information
If detailed link adaptation reports are transmitted, then the completeness of channel information is improved, but the processing complexity and transmission overhead increase
Solution Approach 1:
The patent extracts and transmits only the critical channel state information elements required for effective link adaptation decisions, omitting redundant or less important details. This selective information extraction maintains channel information completeness for decision-making while reducing processing complexity and transmission overhead.
Solution Approach 2:
The patent changes the representation format of channel feedback information to a more compact and efficient parameter encoding scheme. By transforming the information into optimized parameters suitable for wireless transmission, the system reduces the amount of data to be processed and transmitted while preserving the essential channel characteristics needed for link adaptation.
3Productivity
If transmit parameters are updated frequently based on channel feedback, then the system throughput is improved, but the signaling overhead and processing burden increase
Solution Approach 1:
The patent merges channel feedback transmission with existing mandatory control frame exchanges in the wireless protocol (such as acknowledgment frames for data reception). This merging allows feedback to be transmitted during already-scheduled communication intervals, achieving frequent parameter updates for improved throughput without adding separate feedback transmission time overhead.
Solution Approach 2:
The patent implements periodic channel feedback transmission synchronized with the existing frame structure and acknowledgment mechanisms of the wireless protocol. By aligning feedback transmission with periodic control frame exchanges, the system maintains up-to-date transmit parameters for high throughput while utilizing the inherent periodic timing already present in the communication protocol.
Data Source
AI summary
Systems and methods for providing feedback regarding a wireless communication channel is disclosed. A responding processor is configured to estimate condition of the wireless communication channel and generate a data field. The data field includes a communication parameter based on the estimated condition of the wireless communication channel. The data field is attached to a control frame, and the control frame is transmitted with the attached data field. A transmitting processor is configured to receive the control frame, and determine whether the control frame includes the data field. The transmitting processor retrieves the data field from the control frame, and selects, based on the communication parameter in the data field, a transmit parameter for transmitting data over the wireless communication channel.